Add meta to form

docs/documentation/form/select.html

@@ -269,6 +269,12 @@ doc-subtab: select
     <h2 class="subtitle">
       The browser built-in <strong>select dropdown</strong>, styled accordingly
     </h2>
+    {%
+      include meta.html
+      colors=true
+      sizes=true
+      variables=false
+    %}
 
     <hr>
 
@@ -314,9 +320,7 @@ doc-subtab: select
       </div>
     {% endif %}
 
-    <hr>
-
-    <h3 id="select-color" class="title">Colors</h3>
+    {% include heading.html name="Colors" %}
 
     <div class="columns">
       <div class="column is-half">
@@ -327,8 +331,8 @@ doc-subtab: select
       </div>
     </div>
 
-    <hr>
-    <h3 id="select-size" class="title">Sizes</h3>
+    {% include heading.html name="Sizes" %}
+
     <div class="columns">
       <div class="column is-half">
         {{sizes_example}}